package com.wl2o2o.leetcode;

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            int n = in.nextInt();
            int k = in.nextInt();
            int cnt = 0;
            String code = in.next();
            for (int i = 0; i < n; i ++) {
                // System.out.println('T' - 65);
                if (code.charAt(i) - 65 == 12 || code.charAt(i) - 65 == 19) {
                    cnt++;
                }
            }

            int num = n - cnt;
            if (k < num) {
                System.out.println();
            } else {
                System.out.println(cnt += num);
            }

        }
    }
}



